I’m looking into buying a Garret gtx30 generation 2 as that what’s been recommended for my 500 track car and wondered if anyone has had any experience. I nearly went Borg Warner but apparently this is garrets way of saying there still in the game?
its a gtx3071 gen 2 which is rated to 650bhp.

 

I think you want the g30 660 mate there the newest ones I believe not the gtx anymore
I could be wrong but that's how I understand it

https://www.garrettmotion.com/racing...eries-g30-660/

 

..i had that turbo and gt30 also before..not much difference during driving yet i didnt went on dyno..but on road driving it didnt felt much powerfull...than i fitted efr.....omg....different car really...get efr

 

Pretty sure they still do all the older models too, but the G3's are the latest smallish units. Definitely interesting to see how they perform

 

They do mate but if buying new may aswell get latest tech best flow for size, they do all sizes
New g42 for 1450hp

https://www.garrettmotion.com/racing...ries-g42-1450/

G30 for upto 770 hp

https://www.garrettmotion.com/racing...eries-g30-770/

 

Sorry I got a little mixed up there, I’m still a bit new to all the modern goodies as unless it’s a t4 I know nothing lol.

So the turbo that has been recommended is the gtx3071 gen2 which is rated to 650bhp and the reason I’m looking at this is that it’s a direct fit on the existing manifold and internally gated which is good as I haven’t got a lot of space and from an old skool point of view I don’t want the external wastgate etc. It comes with all the bits to fit to the standard manifold and is reasonably priced.

I have been told by 2 tuners that there as good as the Borg Warner I was looking at in terms of spool, power etc and I wont have any hassle fitting it.

 

I’m on a gt35 at the minute and although the lag is like the old t4 by the time it comes on boost I’ve nearly run out of track lol.

 

Garrett G25-660 fitted to my cossie. Should be able to tell you how they perform by the end of the month once the mapping is all done. Just waiting on all parts coming back from ceramic coating.

 

Great stuff can't wait to see how that performs

 

My lad's just ordered a G25 550 for his MK1 Focus RS. Will post some updates when that's up and running too.
Was running 400hp with a Sabre hybrid turbo previously, so should be somewhere north of that once done

 

my lad's been told that he will needs a turbo speed gauge fitted when mapping with the G25 to avoid over spinning the turbo. Never heard of that being needed, and what do you do with it afterwards? Seems an expensive luxury (Ł300+) just for a short period of time?
Any thoughts?

 

I believe there was an efr turbo that was ran higher than the recommended 116000 rpm and sudsequently failed not long after mapping which was a 1000 hp turbo running at 978 hp !
I guess it depends how far you are going to push it, my own car is at 101000 rpm at 2.2 bar of boost but it's on an enormous turbine housing which I believe will help keep the speed abit lower as the hotside is flowing more freely at the loss of some response

But if the turbo is rated at 550 hp and your trying to get close to 550 I think you will need the sensor

 

Monitoring turbo speed can be good for general health and well-being of the setup, and it can be used for boost control. So logging it can be useful.
Sensor is not Ł300. Not sure why some other kits are a lot more though.

https://turbozentrum.co.uk/Speed-sen...-/-781328-0004

But if you dont intend pushing the turbo to its limits, then no it is not necessary.....although without knowing speed...you'd never know where it's limits are lol.

 

That is the problem mate, no sensor on my first gtr but the power just flatlined at 1.7 bar on e50 so the turbos I assume we're flat out, so even boost pressure limiting won't always work

 

Not going to be pushing it to anywhere near it's limit, looking to run at 24psi max which on the focus should equate to ~430.

 

If the mapper is saying you MUST have a speed sensor then they don't sound like a very confident mapper. My mapper told me the boost and turbo speed on these new G-series turbos is so predictable that I wouldn't need one. He said you can use a speed sensor to help getting the boost control perfect at the right rpm but because the turbo is so predictable you can do it without.

im having one on mine as a safety feature as my aftermarket Ecu can control it and can cut boost pressure if it sees a boost leak so no issues of over spinning the turbo but I don't need it for the purpose of mapping.

 

You don't "need" a lot of things...but they can be very good to have.

wants overrule needs ! lol

 

This is a very true statement !

I didnt need a tubular manifold, new turbo and external wastegate but for some strange reason I have emptied my wallet again. Lol 😂

should of just rebuilt the T34 🙈

 

I run a GTX 2867r gen 2 on a CVH , makes boost quick and holds it .

 

We were going to put a GTX2867 on the Focus, but Peron have stopped making the manifolds for them and replaced them with units for the G series hence the move to that turbo

 

Have you got a dyno plot for your escort mate ? Always handy for anyone who's considering that turbo so they can see the curve and spool pal

 

I don't have one for mine , but this is a 2867r on a .63 housing on a CVH .


My normal dyno sheet here ..if any good , map not finished yet though mines a .48 housing,. Makes boost early

 

Ive got a gtx3071 gen2 on my sapphire, i think its great personally, goes very well and no more lag than the previous t34 setup.

 

 

Making some good power, engine dynos tend to show earlier spool than is actually achieved on the road due to excess load, when does it make full boost on the road ?

 

Tbh i dont really know, i havent driven it much since it was completed last summer and have had problems with the rev counter reading wrong and being erratic, ive got my third one ready to go in now but thats old cars for you i guess. Also its bloody lively when it comes on boost as you can imagine so you dont wanna look away from the road 😂

 

So I'm guessing that's 2wd you are running ? With that power it must be a fully built engine. What is the spec of it ?

 

According to my data from the ECU , mine starts making boost at 2350 .

 

Do you know when it first hits full boost mate ?

 

Cossie51- yes its a sapphire 2wd. And yes scs built engine, long studded 200 block, std crank, rods and pistons but have valve cutouts, big wing sump, nick waples head, bd 16 inlet/ 14 exhaust cams, double valve springs, hart inlet, gtx3071 gen 2 with the .63 smallest housing, external wastegate ect

 

It starts to pull hard around 3k and holds it , but it's been progressively mapped.. boost by Gear and traction control etc .

 

Thats some clever stuff how does it know what gear your in ?

 

Via a sensor on the gearbox to the ECU .

 

how mines set at min .

 

Steve that is some impressive power and torque for what is a standard bottom end with just long studs 👍🏻 I was under the impression that you needed forged pistons if you were going much over the 500bhp mark.

I told my mapper to give me something between 450-500 as didn't want to risk blowing it up as bottom end is still standard internals apart from valve cut outs. Forged bottom end was next on my list when It comes off the road at the end of this year. Maybe I should save myself some money and just push it a bit harder as it is.
Hoping manifold and turbo will be fitted and mapping should start next week.

 

engine speed vs road speed.

 

That was on an engine dyno mate, I know rods lost 29 hp 36 ftlb engine dyno then onto motorworx rollers
Im not saying this one has I don't know but just thought I'd mention it as the figures were in my head anyways
The spool was alot different aswell of the turbo about 1250 rpm difference


While the headline figures are close within 30 hp
Engine dyno




And chassis dyno of exact same tune in car




Now if I overlay the 2 plots from 6600 rpm and above the curves are almost identical just 30 hp apart
But from 4000-6250 rpm there is a huge difference



Now above 6600 rpm the load is irrelevant as it's making full boost anyway and the power curves match, but below 6600 rpm it's the high load of the engine dyno causing the early spool that is simply not achievable while driving the car

What I don't know is is wether the superflow engine dynos have user adjustable load points or if there pre set and operator goes through all the presets so to speak ?

It interests me as it helps to understand real world performance from dyno plots if we can disect the data and make it comparable, which for rods there were huge differences

 

Yes its all good on standard stuff according to scs and they’ve done hundreds. Worth bearing in mind its all forged stuff from standard anyway and made by cosworth from my understanding. I guess you should just go with what you’re tuner says and recommend’s mainly

 

Nice figures there -

 

G25-660 fitted. Nice compact turbo, hopefully should make some good power